LoopIt - Free

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LoopIt is a video player capable of playing small HTML5 videos just as if they were gifs. Or if, you know, you don't care about that just disable the loop; that's cool :( Whether you saved a video from Vine, Instagram, Reddit, gfycat, mediacrush or want to play your own content just point the app to the location of your files and start looping. This free version comes with limited functionality. If you require more please consider upgrading. Supported file types: mp4, m4v, webm.

Screenshots from Chrome Web Store